Not an answer to the weevil problem, but maybe if they were drilled out and big planters placed in the cut-down trunks at least some greenery would emanate until the powers that be find a way round the palm issue.

They cut some down in our garden, probably 4 mtrs high and the grubs were still right at the bottom of those.

That's right - the grubs infest the whole tree, not just at the crown.

Unless the infected trees are properly disposed of (which will not happen for economic reasons) the infected trees become a nest for the grubs which will turn into beetles and continue to do their damage.

It takes one beetle to infect a tree and then it produces hundreds of new beetles.

It can only get worse until all the Canary palms disappear altogether.

The people round here are not bothering with the council, they use chain saws to cut the whole thing down to ground level and dump the pieces in the garden rubbish tips, which are constantly overflowing, where the council pick them up, eventually.

It depends on the size of the tree, ours were over 20ft high and the infection was only at the top of the tree, but I have seen evidence when the base of the tree was infected and no infection at the top and this again is an over 20ft tree. Gardener said there were 2 types of beetles one going for the top and the other attacking the bottom.